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clocksource/drivers/nomadik-mtu: Convert init function to return error

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The init functions do not return any error. They behave as the following:

  - panic, thus leading to a kernel crash while another timer may work and
       make the system boot up correctly

  or

  - print an error and let the caller unaware if the state of the system

Change that by converting the init functions to return an error conforming
to the CLOCKSOURCE_OF_RET prototype.

Proper error handling (rollback, errno value) will be changed later case
by case, thus this change just return back an error or success in the init
function.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Daniel Lezcano 2016-06-06 17:58:15 +02:00
parent e1d2b9f024
commit e46105aff5
1 changed files with 29 additions and 16 deletions
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45
drivers/clocksource/nomadik-mtu.c
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@ -193,10 +193,11 @@ static struct irqaction nmdk_timer_irq = {
.dev_id = &nmdk_clkevt, .dev_id = &nmdk_clkevt,
}; };
static void __init nmdk_timer_init(void __iomem *base, int irq, static int __init nmdk_timer_init(void __iomem *base, int irq,
struct clk *pclk, struct clk *clk) struct clk *pclk, struct clk *clk)
{ {
unsigned long rate; unsigned long rate;
int ret;
mtu_base = base; mtu_base = base;
@ -226,10 +227,12 @@ static void __init nmdk_timer_init(void __iomem *base, int irq,
/* Timer 0 is the free running clocksource */ /* Timer 0 is the free running clocksource */
nmdk_clksrc_reset(); nmdk_clksrc_reset();
if (clocksource_mmio_init(mtu_base + MTU_VAL(0), "mtu_0", ret = clocksource_mmio_init(mtu_base + MTU_VAL(0), "mtu_0",
rate, 200, 32, clocksource_mmio_readl_down)) rate, 200, 32, clocksource_mmio_readl_down);
pr_err("timer: failed to initialize clock source %s\n", if (ret) {
"mtu_0"); pr_err("timer: failed to initialize clock source %s\n", "mtu_0");
return ret;
}
#ifdef CONFIG_CLKSRC_NOMADIK_MTU_SCHED_CLOCK #ifdef CONFIG_CLKSRC_NOMADIK_MTU_SCHED_CLOCK
sched_clock_register(nomadik_read_sched_clock, 32, rate); sched_clock_register(nomadik_read_sched_clock, 32, rate);
@ -244,9 +247,11 @@ static void __init nmdk_timer_init(void __iomem *base, int irq,
mtu_delay_timer.read_current_timer = &nmdk_timer_read_current_timer; mtu_delay_timer.read_current_timer = &nmdk_timer_read_current_timer;
mtu_delay_timer.freq = rate; mtu_delay_timer.freq = rate;
register_current_timer_delay(&mtu_delay_timer); register_current_timer_delay(&mtu_delay_timer);
return 0;
} }
static void __init nmdk_timer_of_init(struct device_node *node) static int __init nmdk_timer_of_init(struct device_node *node)
{ {
struct clk *pclk; struct clk *pclk;
struct clk *clk; struct clk *clk;
@ -254,22 +259,30 @@ static void __init nmdk_timer_of_init(struct device_node *node)
int irq; int irq;
base = of_iomap(node, 0); base = of_iomap(node, 0);
if (!base) if (!base) {
panic("Can't remap registers"); pr_err("Can't remap registers");
return -ENXIO;
}
pclk = of_clk_get_by_name(node, "apb_pclk"); pclk = of_clk_get_by_name(node, "apb_pclk");
if (IS_ERR(pclk)) if (IS_ERR(pclk)) {
panic("could not get apb_pclk"); pr_err("could not get apb_pclk");
return PTR_ERR(pclk);
}
clk = of_clk_get_by_name(node, "timclk"); clk = of_clk_get_by_name(node, "timclk");
if (IS_ERR(clk)) if (IS_ERR(clk)) {
panic("could not get timclk"); pr_err("could not get timclk");
return PTR_ERR(clk);
}
irq = irq_of_parse_and_map(node, 0); irq = irq_of_parse_and_map(node, 0);
if (irq <= 0) if (irq <= 0) {
panic("Can't parse IRQ"); pr_err("Can't parse IRQ");
return -EINVAL;
}
nmdk_timer_init(base, irq, pclk, clk); return nmdk_timer_init(base, irq, pclk, clk);
} }
CLOCKSOURCE_OF_DECLARE(nomadik_mtu, "st,nomadik-mtu", CLOCKSOURCE_OF_DECLARE_RET(nomadik_mtu, "st,nomadik-mtu",
nmdk_timer_of_init); nmdk_timer_of_init);